Notes Payable Notes Payable - Schedule of Borrowings (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Jul. 31, 2012
Short-term Debt [Line Items]
Weighted average borrowing rate	1.20%
Outstanding balance on credit facility	$ 58,658	$ 0
USD-Denominated Borrowing [Member]
Short-term Debt [Line Items]
Interest rate	1.30%
Notes Payable	$ 47,000
USD-denominated credit facility China [Member]
Short-term Debt [Line Items]
Interest rate	1.1332%